Electric scocket



May 8, 1928.

J. B. DOWNING ELECTRIC SOCKET Filed Oct. 6, 1924 2 Sheets-Shgeet '1 May s, 1928. 1,669,122

' J. B. DOWNING ELECTRIC SOCKET Filed Oct- 6, 1924 2 Sheets-Sheet 2 JOHN B. DOWNING,

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Application 'flled october 6,1924.- SerialNox74h938." 77 1 This invention relates particularly to the type of sockets commonly called plural sockets, which are used to obtain additlonal outlets from an existing single socket or receptacle outlet.

In'sockets of this type that I am familiar with and particularly those in which the female or outlet shells are not moulded into the composition, I have found the objectionable feature of the shells rotating and be coming loose. When these shells loosen, there is a tendency for the various parts of opposite polarity to come into contact with each other and thereby cause a short circuit, which of course might result in serious damage.

In this invention, I have devised means for overcoming this and at the same time provided a structure which is very substantial and at the same time economical to man ufacture.

Reference is directed to the drawings in which-- Figure 1 shows the socket assembled in one half of the casing.

Figure 2 is an exterior view of the socket. Figure 3- is an interior half.

Figure 4- is a binding screw washer.

Figure 5 is a perspective view of the male shell plug, taken from the top.

Figure 6 is a perspective view of the male shell plug, taken from the bottom.

Figure 7- is an insulating strip.

Figure 8 is a perspective view of the male shell, taken from the base.

Figure 9- is a connector member.

Figure 10 shows a method of interlocking the female shells.

Fi ure 11- shows the means of connect ing the conductor to the lower screw shells.

In carrying out. my invention, I employ a casing made from insulating material and composed of two parts which are duplicates of each other. These partsare indicated as 1, Figures 1 and 2. These half casings'are preferably held together by screws 2-2 and nuts 3-3 The lower ends of the casings are provided with beads or flanges i -4, which permit the fastening of a shade holder (not shown) to the socket. These beads View of the case also tend to strengthen thewasi-ng .at 3 this point.

Associated with the casing are screw shells 55, havingvflanges 6-45, which facilitate the insertion of a lamp or attachment plug. The base of the screw shells 5-5 are cut out as at 7-7"7 and the case provided with recesses 88. Passing thru these cut outs and lying within the recesses is an insulating strip 9, which holds the screw shells 55 in place and at the same time prevents them from rotating when a lamp or attachment plug is screwed into place.

- To further prevent rotation the shells are interlocked as shown'by Figure 10.

A third screw' shell 10 is provided for connecting the socket to another socket or outlet receptacle. This screw shell is maintained in place by a plug 11, made of porcelain or other suitable insulating material.

To prevent the rotation of the screw shell 10, and the plug 11, the base of the shell has a rectangular opening 12, and the plug has a rectangular boss 13, which passes thru opening 12 and into a recess 14, in the easing 1. i

The base of the screw shell 10, is formed with indentations 15 15. Clearances 7 16-16 are provided in plug 11, to accommodate these indentations.

The bases of the screw-shells 5, 5, are slit to form straps 17-17.

To provide an electrical path between the screw shells '55, and 10, wire conductors 1818 are passed under the straps 1717 and soldered. The opposite ends are located in indentations 15l5 of shell 10.

To pro vide the second electrical path of the circuit a U shaped member havingproectmg arms 19 19; a base 20 which has'a 55, which in turn rest against shoulders 25 of easing 1; thus binding the entire group of parts into a unitary structure.

threaded hole and connecting links 21-21,

9 tightly against the base of .Jthe shells lfAn electric lamp socket comprising a casing, a male shell and plug, a plurality of female shells, an insulating member passing thru openings in said female shells and lying within recesses in said casing, said insulating member in conjunction with a center contact member and screw, clamping said female shells rigidly against shoulders in said 1 casing and means for electrically connecting the male shell to the female shells.

2. In a plural electric socket, a plurality of receptacle shells having means to prevent relative rotation between them; said means 20 comprising the remaining edges of a cut away portion of the base section of one of the shells abutting against like remaining edgesof a cut away portion of another shell.

Signed by me this 3rd day of October, 25

1924, at Newa 1'k; N. J.

JOHN B. DOWNING. 

